$ git clone -n https://src.fedoraproject.org/rpms/pisg.git /var/lib/mock/f41-build-889686-16837/root/chroot_tmpdir/scmroot/pisg
Cloning into '/var/lib/mock/f41-build-889686-16837/root/chroot_tmpdir/scmroot/pisg'...
$ git fetch origin b83e8cd5cfe6c031010ad542d54693e558f58382:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pisg
 * [new ref]         b83e8cd5cfe6c031010ad542d54693e558f58382 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b83e8cd Eliminate use of obsolete %patchN syntax (#2283636)